What happened at Cho’s high and middle school?

The Whole Class Started Laughing and Saying, “Go Back to China” – Blake Fleetwood

At Westfield High, there were many signs that Cho was deeply disturbed, dangerously alienated and horribly tormented. Teachers and school officials should have noticed and taken action for his undiagnosed autism and alienation. A guidance counselor should have talked to Cho and his parents. Educators could/should have consulted with his teachers – who all saw the problems – and gotten help for this tormented child.

I am finding it so eery and suspicious that we don’t have volumes of articles and information from Cho’s high school and middle school experience. Why didn’t anyone do anything before? How negligent were they? Because of the dearth of information so far, it just seems to me like the picture was ugly all along.